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<p>It can be used to pass information to the back-end of the compiler.<br>
</p>
<p>This declaration is conditionally-supported and implementation defined, 
meaning that it may not be present and, even when provided by the implementation, it does not have a fixed meaning
</p>
<table id="toc" class="toc"><tr><td>
<div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="asm.html%23Syntax"><span class="tocnumber">1</span> <span class="toctext">Syntax</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="asm.html%23Explanation"><span class="tocnumber">2</span> <span class="toctext">Explanation</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="asm.html%23Examples"><span class="tocnumber">3</span> <span class="toctext">Examples</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="asm.html%23External_links"><span class="tocnumber">4</span> <span class="toctext">External links</span></a></li>
</ul>
</td></tr></table>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Syntax">edit</a>]</span> <span class="mw-headline" id="Syntax">Syntax</span>
</h3>
<table class="t-sdsc-begin">

<tr>
<td colspan="10" class="t-sdsc-sep">
</td>
</tr>
<tr class="t-sdsc">
<td class="t-sdsc-nopad"> <code><b>asm (</b></code> <span class="t-spar">string_literal</span> <code><b>)</b></code> <code><b>;</b></code>
</td>
<td class="t-sdsc-nopad">
</td>
<td class="t-sdsc-nopad">
</td>
</tr>



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<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Explanation">edit</a>]</span> <span class="mw-headline" id="Explanation">Explanation</span>
</h3>
<p>The <span class="t-spar">string_literal</span> is typically a short program written in assembly language, which is executed whenever this declaration is executed. Different C++ compilers have wildly varying rules for asm-declarations, and different conventions for the interaction with the surrounding C++ code.
</p>
<p>As other <a href="declarations.html" title="cpp/language/declarations">block declarations</a>, this declaration can only appear inside a block (a function body or another compound statement).
</p>
<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style=""><tr>
<td class="mbox-empty-cell"></td>
<td class="mbox-text" style="">This section is incomplete<br>Reason: write a note on GCC extended assembly syntax, since it is now supported by Intel, IBM, Sun (as of v12), etc </td>
</tr></table>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Examples">edit</a>]</span> <span class="mw-headline" id="Examples">Examples</span>
</h3>
<div class="t-example">
<p> Demonstrates two kinds of inline assembly syntax offered by the GCC compiler. This program will only work correctly on x86_64 platform under Linux.
</p>
<div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
    <span class="kw4">int</span> n <span class="sy1">=</span> <span class="nu0">7</span><span class="sy4">;</span>
    <span class="co1">// extended inline assembly</span>
    asm <span class="br0">(</span><span class="st0">"leal (%0,%0,4),%0"</span>
         <span class="sy4">:</span> <span class="st0">"=r"</span> <span class="br0">(</span>n<span class="br0">)</span>
         <span class="sy4">:</span> <span class="st0">"0"</span> <span class="br0">(</span>n<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/basic_ostream.html"><span class="kw1439">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"7*5 = "</span> <span class="sy1">&lt;&lt;</span> n <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
 
    <span class="co1">// standard inline assembly</span>
    asm <span class="br0">(</span><span class="st0">"movq $60, %rax<span class="es1">\n</span><span class="es1">\t</span>"</span> <span class="co1">// the exit syscall number on Linux</span>
         <span class="st0">"movq $2,  %rdi<span class="es1">\n</span><span class="es1">\t</span>"</span> <span class="co1">// this program returns 2</span>
         <span class="st0">"syscall"</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>Output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">7*5 = 35</pre></div></div> 
</div>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: External links">edit</a>]</span> <span class="mw-headline" id="External_links">External links</span>
</h3>
<ul>
<li>
<a rel="nofollow" class="external text" href="http%3A//www.ibiblio.org/gferg/ldp/GCC-Inline-Assembly-HOWTO.html">GCC Inline Assembly HOWTO</a>
</li>
<li>
<a rel="nofollow" class="external text" href="http%3A//pic.dhe.ibm.com/infocenter/comphelp/v121v141/topic/com.ibm.xlcpp121.aix.doc/language_ref/asm.html">IBM XL C/C++ Inline Assembly</a>
</li>
<li>
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<!-- 
NewPP limit report
Preprocessor visited node count: 921/1000000
Preprocessor generated node count: 5632/1000000
Post‐expand include size: 45575/2097152 bytes
Template argument size: 6143/2097152 bytes
Highest expansion depth: 17/40
Expensive parser function count: 0/100
-->

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